trasborg Kaiser M715 - engine Driven Fan - Photo 9290866

If you're still running an engine-driven fan, make sure the blades are in decent shape, but more importantly, if you have a clutch, make sure it works. Run the engine up to operating temperature by driving it around for a while, then shut it off. The clutch should be engaged at that point and not allow you to turn the fan, or at least provide resistance to you turning it. Most importantly, make sure your fan shroud is in good shape.